package com.zy.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.fastjson.JSON;
import com.zy.utils.MsgUtil;

@Controller
@RequestMapping("img")
public class ImgController {

	
	
	@ResponseBody
	@RequestMapping("imgCode")
	public String imgCode(String imgCode, HttpSession session) {
		Object obj = session.getAttribute("imgCode");
		MsgUtil msg = new MsgUtil();
		if (obj == null) {
			msg.setSuccess(false);
			msg.setMessage("刷新浏览器");
		} else {
			String code = String.valueOf(obj);
			if (imgCode.equals(code)) {
				msg.setSuccess(true);
			} else {
				msg.setSuccess(false);
				msg.setMessage("验证码错误");
			}
		}
		return JSON.toJSONString(msg);
	}
	
	
	@RequestMapping("img")
	public void img(HttpServletRequest request, HttpServletResponse response, HttpSession session) throws IOException {
		int width = 63;
		int height = 37;
		Random random = new Random();
		// 设置response头信息
		// 禁止缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		// 生成缓冲区image类
		BufferedImage image = new BufferedImage(width, height, 1);
		// 产生image类的Graphics用于绘制操作
		Graphics g = image.getGraphics();
		// Graphics类的样式
		g.setColor(this.getRandColor(200, 250));
		g.setFont(new Font("Times New Roman", 0, 28));
		g.fillRect(0, 0, width, height);
		// 绘制干扰线
		for (int i = 0; i < 40; i++) {
			g.setColor(this.getRandColor(130, 200));
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int x1 = random.nextInt(12);
			int y1 = random.nextInt(12);
			g.drawLine(x, y, x + x1, y + y1);
		}
		// 绘制字符
		String imgCode = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			imgCode = imgCode + rand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(rand, 13 * i + 6, 28);
		}
		// 将字符保存到session中用于前端的验证
		session.setAttribute("imgCode", imgCode);
		g.dispose();
		ImageIO.write(image, "JPEG", response.getOutputStream());
		response.getOutputStream().flush();

	}

	// 创建颜色
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

}
